X0306 4 2023-01-11 0 0001381197 Interactive Brokers Group, Inc. IBKR 0001391405 Peterffy Thomas PHILLIPS POINT EAST TOWER, SUITE 1001 777 S. FLAGLER DRIVE WEST PALM BEACH FL 33401 1 1 0 0 Chairman Class A common stock 2023-01-11 4 S 0 17700 75.62 D 1838405 D Class A common stock 2023-01-11 4 S 0 2300 76.42 D 1836105 D Class A common stock 2023-01-12 4 S 0 5500 75.01 D 1830605 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.08 to $76.07. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (4) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.08 to $76.57. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.00 to $75.08. /s/ Raymond Bussiere as authorized signatory for Thomas Peterffy 2023-01-13